Mil Dtl 5541 Type Ii Class 3
Mil Dtl 5541 Type Ii Class 3
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"MIL-C-5541 Type i & 2, and Course 1A & iii -- understand the differences"
Tutorial:
RoHS = curt for the European Parliament's directives on "Reduction of Hazardous Substances".
This particular directive is concerned with the constitution of the end-product item in question, not the materials used in its manufacture (although other directives similar REACH may regulate the use of chancy materials in the manufacturing process).
Example of the distinction: hexavalent chrome is used both in some chromate conversion coatings for zinc plating and for aluminum (some of the Alodines and Iridites) and in well-nigh chrome electroplating. Articles which have a hexavalent chromate conversion blanket contain hexavalent chromium as shipped & equally used, and may therefore release it, and are thus a RoHS business organization; but chrome electroplating produces a coating of zero valence metal and is therefore not a RoHS concern.
Back to the chromate conversion processes: In the sometime days, until a few years into this century, the main alternative to hexavalent chromate coatings was trivalent chromate coatings and they were vastly inferior to hexavalent, especially in corrosion resistance. These days some trivalent coatings are equal (at least in corrosion resistance) to hexavalent.
Consequently, Mil-DTL-5541 [link is to complimentary spec at Defense Logistics Agency, dla.mil] has been expanded from earlier -5541 releases to now embrace both types.
Current question and answers:
June 19, 2021
Q. Is there whatsoever show of incompatibility between a Class I and a Class Ii chem film if these are in the same electric bonding interface?
Ted Laurvik
EMC engineer - Centennial
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June 2021
A. Hi Ted. I recollect you accept a typo because to my knowledge there is no 'Grade Ii'. At that place is Grade 1A and Form 3. At that place is likewise a Type I (hex chrome) and a Type Two (non-hex chrome) though.
Sometimes the aforementioned chemical is used for the Class 1A and Course 3 needs, and I believe the spec tells you to ignore the chromate in calculating galvanic compatibility, so I wouldn't foresee any between the various combinations.
Luck & Regards,
Ted Mooney , P.E. RET
Striving to live Aloha
finishing.com - Pino Embankment, New Jersey
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June 18, 2021
Bravo! I read a lot of quite valid answers to good questions hre. The only thing that puzzled me was what RoHS was. I have been around the MIL-DTL 5541 and MIL-DTL-81706 world for a few decades. I was happy to see the 81706 answer for Ender. Typically I see people confusing the procedure spec (5541) with the material spec (81706).
Ted Laurvik
- Centennial Colorado
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August five, 2021
Q. a customer cartoon : AMS-C-5541 1A YELLOW (ROHS) 168H sst.
Merely my supplier told me : yellow conversion coating needing to pass 168 hours salt spray must exist Hexavalent chromium, and cannot pass ROHS. Non chromium treatment cannot laissez passer 168H sst -- is it right ?
Kasen Kwong
- NYC NY
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August 2021
A. Hi Kasen.
What you heard is incorrect but information technology may have a seed of truth. Trivalent chromates are just equally corrosion resistant these days as hexavalent ones, so a 168 hour salt spray test should not be a challenge. But it might exist truthful that there is no chromate which is adequate to AMS-C-5541 and yellow and RoHS compliant.
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Luck & Regards,
Ted Mooney , P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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Closely related historical postings, oldest first:
Jan 28, 2008
Q. What is the difference between these two mil standards? Is i for a clear RoHS compliant and the other for a yellow RoHS compliant? Or is the Mil-C-5541 for clear RoHS and Mil-DTL-5541 [link is to gratuitous spec at Defense Logistics Agency, dla.mil] for yellow hex. Please let me know. Give thanks you.
Mike Logan
plating shop employee - Minneapolis, Minnesota
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Feb 4, 2008
A. Mike, Hi.
Type I - Compositions containing Hex Chrome
Type Two - Compositions containing no Hex Chrome
Course 1A - For maximum protection against corrosion, painted or unpainted.
Mil-C-5541 did not mention Type I or II whereas Mil-DTL-5541 [link is to free spec at Defense Logistics Agency, dla.mil] does. Class 1A is the same for both standards. For Mil-DTL-5541, it is very articulate when Type 2 is mentioned, the conversion coating shall not contain Hexavalent Chrome, hence, RoHS compliant. When Type I is mentioned, the conversion glaze contains Hexavalent Chrome but it may non necessarily be yellow. There are clear conversion coatings out there which are Hexavalent chromium based. As far as I am concerned, there is no yellow conversion coat (yellow chromate if you adopt) that is Type Two. If you have time check out http://assist.daps.dla.mil ^ quicksearch.dla.mil and bank check out some fantabulous trivalent chromium base conversion coats (Henkel, Surtec, Macdermid, Luster On ) which can, incidentally be classified as Type Ii.
SK Cheah
- Penang, Malaysia
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Ed. note: The address for the mil spec service was updated as noted since Cheah's posting
Feb 28, 2008
A. Mike,
Further readings on before posts at finishing.com, patently, there are yellow conversion coating that is Type 2 - clear conversion blanket with xanthous dye.
SK Cheah
MST - Penang Malaysia
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Hi Cheah. I think a big betoken of possible confusion is that there may be RoHS compliant trivalent conversion coatings which are yellow, either through the add-on of dye or considering they are thick-film and naturally yellow, but which are not be on the QPL withal -- which means you're non compliant with MIL-DTL-5541 if yous use them. Then information technology probably isn't correct to call such coatings Type Two ... just telephone call them xanthous and RoHS-compliant :-)
Regards,
Ted Mooney , P.E.
Striving to live Aloha
finishing.com - Pine Embankment, New Jersey
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August 27, 2009
Q. Tin can anyone tell me what are the differences in the new standards ( Mil-DTL-5541 [link is to free spec at Defense Logistics Agency, dla.mil]F) every bit compared to the onetime.
Thomas Joseph
Precision Metal Fabricator - Singapore
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A. Hi Thomas. We appended your question to a thread where SK Cheah had answered the question: RoHS-compliant (Blazon 2) coatings were not part of the old Mil-C-5541 standards. Good luck.
Regards,
Ted Mooney , P.E.
Striving to alive Aloha
finishing.com - Pine Beach, New Jersey
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December six, 2013
Q. Is Iridite per MIL-C-5541E, grade 1A compliant with RoHS?
Senthil Kumar
- Bangalore, India
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December 9, 2013
A. Hi Senthil. Iridite is a Macdermid merchandise name for a range of chromate conversion blanket processes, some of which are surely RoHS compliant, whereas others migh be based on non-compliant hexavalent chrome. Practiced luck.
Regards,
Ted Mooney , P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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September 26, 2014
Q. Is the part processed per blazon I hazardous in whatsoever way? Or just the chemical solution used in the procedure? We accept parts candy per type I versus required type 2. The client is giving us a difficult time. Thank you.
david ho
- Milford, Connecticut, usa
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September 2014
A. Hi David. RoHS is curt for the European Parliament's directives on Reduction of Hazardous Substances, and refers to the constitution of the parts, not the processes used to manufacture the parts. The state of affairs is merely that parts processed in Type Two solutions do not put hexavalent chromium on the parts, then the parts are very probable to be RoHS complaint. Processing parts per Blazon I does put hexavalent chromate on the parts, and they are unlikely to laissez passer a test for RoHS compliance.
Many domestic and non-European customers are requiring RoHS compliance as well, so it is understandable that your customer is giving you a hard time -- he may not be able to utilise the parts.
"...hazardous in any way?" is relative and qualitative, and then I don't recollect anyone can definitively reply. But a erstwhile governor of NJ once declared that " 'toxic' is a thing of statute, not opinion", and I think we can look at the word 'chancy' in the aforementioned style: if you lot want to send them to Europe only RoHS says they're hazardous, they're hazardous. Proficient luck.
Regards,
Ted Mooney , P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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June eight, 2016
Q. Is Mil-DTL-5541 [link is to free spec at Defense Logistics Agency, dla.mil] Grade 1A Gold Alodine acceptable for the Spacex callout:
Chemical conversion blanket Grade 1A using Alodine 1200 or equivalent? Thanks, gs
Gary Schneider
Quality Inspector - Mtn. View, California Usa
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June 16, 2016
A. Hi Gary,
Without being a Spacex employee I cannot guarantee my answer is correct, just they can practice that, just information technology does look like information technology is meant to relate to MIL-DTL-5541 Grade 1A, of which Alodine 1200 is on the QPD for MIL-DTL-81706 "Chemical Conversion Materials For Blanket Aluminum And Aluminum Alloys".
Brian Terry
Aerospace - Yeovil, Somerset, UK
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October xiii, 2016
Q. Is in that location a MIL-DTL-5541, Type II Class 1A Chem film that is doesn't contain hex chrome?
Gary Smith
- Everett, Massachusetts USA
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Oct 2016
A. Hi Gary_. Yeah, at that place are several -- Mil-DTL-81706 [link is to costless spec at Defense Logistics Agency, dla.mil] lists them. Type II in actual result essentially means "doesn't contain hex chrome". Proficient luck.
Regards,
Ted Mooney , P.East. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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December 13, 2020
Q. Is that possible that Mil-DTL-5541 [link is to free spec at Defense Logistics Agency, dla.mil] type II class 1a or blazon I class three blanket processes on Aluminum alloys?
ender toprak
- Ankara, Turkey
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December 2020
A. How-do-you-do Ender. Yes, there are two types and two classes. If I am understanding your question correctly, the reply is that all four combinations are listed in MIL-DTL-81706 and its Qualified Products List Database (QPL).
Luck & Regards,
Ted Mooney , P.E. RET
Striving to live Aloha
finishing.com - Pino Embankment, New Jersey
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